Hoisting apparatus



June 23, 1931. i c, ZETTERLUND 1,810,936

HOISTING APPARATUS Filed Nov. 5, 1928 3 Sheets-Sheet l VZ Z Jaw/2227 lm/ W111 f 1/0; wjww W? c. ZETTERLUND 1,810,936

HOI STING APPARATUS June 23, 1931.

Filed Nov. 5, 1928 s Sheets-Sheet 2 June 23, 1931. c, ZETTERLUND 1,810,936

HOI STING APPARATUS Filed Nov. '5, 1928 3 Sheets-Sheet :5

' 1920 .50 41 f 48 l 79 2a 2 341 .59 26 I0 I 52 i V 27 7 J1 J2 3 a 10 m rm IT' m .ZZEWWZW- Patented June 23, 1931 i f u ifiTl D STAT-ES CARL VZETTERLUND, on cnronso, ILLINOIS .HorsrI NGAPBARn'rUs V 1 Application hammer "1928.? seri rnb. 317,176.

My-invention relates broadly to hoists for elevating machines used particularly for elevating building material and similar objects H to higher levels, say in the construction of *5 buildings, and has particular reference to a machine of this type which is automatic in the operation of stopping the'elevatorplatforms when reaching a predetermined level. An object of the invention is to provide a it} machine of the above mentioned general character whereby two or more elevator plat-forms will be alternately raised and lowered by suitable power apparatus, to desired'levels, and will there be automatically stopped.

A further object of the invention is to provide a structure wherein the mechanism for elevating the elevator platforms includes an improved ty'peof reversing mechanism opmoved to neutral position when the ascending elevator platform reaches the unloading level.

2 5 Further objects and advantages of. the invention will be apparent from the following" detailed description when taken in connection with the accompanying drawings. In the drawings: Figure 1 is a side elevational view of a machine embodying the invention;

Fig. 2 is'a top plan view of the same; i Fig. 3 is atransverse vertical sectional view taken on line 33 of Fig. 2; '35 Fig. 4 is a sectional view taken on the line .HofFig.3;and, Fig. 5 isa detail view ofthe driving con nection. j f 'Referring more particularly to the draw- 'io ings wherein I have shown a preferred embodiment of the invention, any suitable base may carry uprights or standards 11 which are connected at the top by a suitable cross member 12. These standards and necessary 7 45 cross-connections provide a main supporting frame of conventional form, furnishing guides for the elevator platforms 14 and 15. It will be understood that while only two of such platforms are illustrated, the mech- 50 anism herein disclosed may be adapted to erable by manually actuated means at the un latter in opposite directions.

a hoisthaving any desirable number of "platforms-,d'epending upon the construction and type of hoist used. Supported by topcross' member 12 are sheaves 16 and 17 about which the ends 18 and l9of a cable are trained for connection to said platforms 14 and 15, This cable is adpated alternately to raise and lower the platforms and, as a consequence, when one end of the cable is being wound upon a drum 20, the other end is being released, which action results in the raising of one of the platforms and'in the lowering of the other. r I 7 His apparent from Figures 1 and 2 that both ends of the cable extend downwardly and under a double pulley 21, suitably supported upon or adjacent to base'10, from where said'ends 18 and 19 of the cable are wound in the usual manner around drum 20.

The power fonoperating drum 20 and for providing alternate rotation to lower and raise platforms 14: and 15 is obtainedthrough a reversing mechanism'suitably carried upon platform 10. It will be understood that any suitable source of power may be employed to drive this reversing mechanism.

A bracket or suitable frame 21 may be mounted upon platform lO and arranged with vertical standards 23 and 24 for supporting I the drive and reversing"mechanism. Bearings25 and 26 are furnished in these standards to receive concentrically arranged drivingsleeves-27 and '28. 'Sleeves27 and 28are disposed in bearing 26, each projecting to the right a predetermineddistanceto receive op.- positely rotating drive gears 29 and 80.

These gears may. be keyed or otherwise suit-' ably fastened to the sleeves-for driving-the The driving connection may comprise gear 31,- meshing with outergear 30, and also an intermediate gear 32, which is arranged to mesh with gear 29. It will benoted in Figure 5 that the gear ratios for the drive gears 29 and 30 are equal, whereby the sleeves 27'and 28 rotate in reverse directions at equal speeds. 1 Sleeve 28 is relatively short and carries a clutch dog 33 thereon. ceived by the opposite frame bearing 25.

Spaced at afixed' distance from clutch dog Sleeve 27 extends crosswise and is re- 33 is a second clutch dog 34 secured to sleeve 27. These clutch dogs 33 and 34, being secured to sleeves 27 and 28, respectively, rotate of course in opposite directions.

Referring to Figure 3, drum 20 is loosely mounted on sleeve 27 and is provided with a projection 35, to which is pivoted a clutch element 36 at 36. Sleeve 27'is slotted at 37 to receive pin 38, whereby a collar 39 may be shifted along sleeve 27 and yet be rotatable therewith. This clutch collar 39 is grooved at 40 to receive clutch pins 41 carried by clutch element 36. Clutch element 36 isfur 23 may be furnished with frame extension 47, provided with oppositely extending ears 48 and 49, the ear 48 constituting a bearing for pin 50, which pin 50 is adapted to carry a clutch yoke 51 having studs 52 for riding in grooved collar 46 Theupper end of shaft 50 is adapted to carry a segment 53 arranged to mesh with a gear 54 carried by a shaft 55 in frame extension 49. i

A control or actuating device 60. having outwardly extending arms 61, 62, 63 and 64, is arranged as shown in Fig. 2, in a position relative to the front of the hoist structure so that control cables 65 and 66 may be attached to the arms 61 and 62, respectively.

Control cables 65 and 66 attach to the front ends of pivotally mounted control levers 67 and 68, which levers may be adjustably carried on the hoist structure so as to be positioned at the unloading level of elevator platforms, 14 and 15. Similar control cables 69' and 70 attach to the rearends of control levers 67. and 68 and entrain, under pulleys 71, whereby to extend forwardly to'be attached to arms 64 and 63, respectively, of actuating device 60. This device is attached to the upper end of shaft 55 carrying gearv 54. Control levers 67 and 68 are arranged to project in the pathof movement of-elevator-platforms 14 and 15 .whereby, as either elevator platform ascends to its unloading level, the front end of the control lever engaged thereby will be moved upwardly, thereby pulling either control cable or 66'with it, to rotate actuating device 60 about its mounting shaft 55. Such rotation of actuating device 60 rotates gear 54 and thereby rotates segment 53, which rotational movement is translated into a lineal movement by means of pin 50 and clutch yoke 51,- to shift shaft 45. When gear 54 engages segment 53 midway, clutch element 38 is in neutral position. On the other hand, when gear 54 is rotated in either direction to engage either end of segment 53, clutch element 36 is in engagement with either of clutch dogs 33 or 34 to drive drum 20.

Assume that elevator 14 is ascending to the unloading level. The front end of control lever 68 will be engaged by this elevator 14 and swung upwardly whereby to actuate control cable 66. This cable 66 fastening to arm 62 will rotate actuating device 60 and cause gear 54 to swing segment 53 to a neutral position shown in Fig. 2. The rotation of this segment shifts shaft 45 outwardly to throw clutch element 36 out of engagement with clutch dog '34. The driving mechanism is thereby disconnected from driving relation with drum 20 and elevator 14 will remainat its unloadinglevel. If it is thereafter desired to raise platform15 and allow platform 14 to descend, therear end of control lever 67 is raised, which action actuates control cable 69 to move actuating device 60 counterclockwise. Segment 53 will be moved clockwise to shift clutch'element 36 into engagement with clutch dog 33. Drum 20 is then rotated until elevator platform 15 engages the front end ofcontrol arm 67. Controlcable 65 is thereby actuated to rotate actuating device 60 clockwise in order to return clutch element 36 to neutral position. Actuation of control cable 70 by the resetting of control lever 68 will rotate actuating device 60 and shift clutch element 36 into engagement with clutch dog34. A

Braking means maybe employed to, check the rotation of and hold the drum 20 against movement when the driving mechanism above described is in neutral position. Drum 20 is provided with an extension 79 furnishing a brake drum having a relatively large braking area for a brake band 80. -A pair of springs 81 and 82. secured on opposite sides and between the ends of brake band 80 normally tend to apply the band against the brake drum. .This action is overcome by means of a cam element 84 carried at the lower end of shaft 55 and acting to spread the ends of the brake band .80, when the driving mechanism is in driving engagement with drum 20. This cam element 84 is preferably rectangular in shape and lies between the ends of the brake band 80. When actuating device 60 is rotated, cam element 84 is turned whereby to apply the brake band 80 against the brake drum when the driving mechanism is in neutral position, and to release the brake band when the drive is connected to rotate drum 20. This braking means is very compact and effective, in view of'its directflapplication of the braking powerto the drum 20 andalso in view of the maximum braking. area which is obtained by positioning the brake on the drum.

Without further elaboration, the foregoing will so fully explain the, gist of my invention, that others may, by applying current knowledge, readily adopt the same for use under varying conditions of service, without eliminating certain features, which may properly be said to constitute the essential items of novelty involved, which items are intended to be defined and secured to me by the following claims.

I claim:

1. In a hoist of the type described, the combination with a pluralityof elevator platforms adapted to be alternately raised and lowered, of mechanism for operating said elevator platforms comprising a pair of drive gears, concentric sleeve members driven by said gears, clutch dogs carried by said sleeves, a clutch element adapted alternately to engage said dogs, a drum for winding thereon a cable leading to said elevator platforms, the alternate engagement of said clutch element with said dogs producing alternate reverse rotation of said drum whereby said platforms are raised and lowered in proper sequence, a slidable shaft within said sleeves for shifting said clutch element in either of its engageable positions with said dogs, and means controlled by the position of said elevator platforms for actuating said shaft.

7 2. In a hoist of the type described, the combination with elevator platforms, a suspensory cable therefor, a drum for actuating said cable, driving mechanism for said drum comprising oppositely rotating drive gears, concentrically arranged sleeves driven by said gears and loosely carrying said drum, a pivotally mounted clutch element carried by said drum, clutch dogs operably associated with said sleeves, and a slidable shaft in the inner concentric sleeve for shifting said clutch element into engagement with either of said clutch dogs.

3. In a hoist of the type described, the combination with elevator platforms, a suspensory cable therefor, drum means for actuating said cable, mechanism for alternately rotating said drum means in opposite directions comprising a pair of clutch dogs rotating in opposite directions, a clutch element pivotally carried adjacent said drum means for alternately engaging said clutch dogs, and means controlled by the position of said elevator platforms for shifting said clutch element into engagement with either of said do s.

5%. In a hoist of the type described, the combination with elevator platforms, a suspensory cable therefor, drum means for actuating said cable, a pair of oppositely rotating shafts, a. clutch dog for each shaft, and a clutch element pivotally carried in driving relation on-said drum means for al- 'ternately engaging said clutch dogs.

5. In a hoist of the type described, the combination with elevator platforms, a suspen sory cable therefor, drum means for actuating said cable,a pair of oppositely rotating of said sleeves, a clutch" dog for each sleeve, V

a clutch element pivotally carried in driving relation on said drum means, and means slid ably arranged within said sleeves for shiftingsaid clutch element into alternate engagement with either of-said clutch dogs. 4 v 7. In a hoist of the type described, the combination with elevator platforms, a suspensorycabletherefor, drum means for actuating said cable, a driveforsaid drum means including reversing mechanism for reversing the rotation of said drum means, an actuat ing device-for said reversing mechanism, said actuating device being rotatable to neutral and driving positions, tiltable control members at the unloading level engageable by said elevator platforms, and control cables attaching to each end of each control member and extending to said actuating device, the engagement of sald control members at one end by said elevator platforms moving said movement of said segment into lineal move 1 ment to actuate said shiftable clutch element, a gear in mesh with said segment, an actuating device for said gear, and control cables extending to saidactuating device for operating the same according to the position of said elevator platforms.

9. In a hoist of the type described, the combination with elevator platforms, asuspensory cable therefor, drum means for actuating said cable, mechanism for reversing the rotation of said drum means comprising'a pair of oppositely rotating concentric sleeves, a clutch dog for each sleeve and a clutch element pivotally carried in driving relation on said drum means for alternately engagingsaid clutch dogs, an actuating device for said reversing mechanism, said actuating device being rotatably 'mounted and movable by rotation to neutral and "driving positions,

' and means associated withsaid actuating debrake means for said drum, resilient means tending normally to apply said brake means,

vice andeoperable by rotation thereof to release said brake means when said actuating device ismoved to driving position.

10. In a hoist of the type described, the combination with elevator platforms, a sus pensory cable therefor, drum means for actuating said cable,mechanism for reversing the rotation of said drum means comprising apair of oppositely rotating [concentric sleeves, a clutch dog for" each sleeve and a clutch element pivotally carried in driving relation on said drum means for alternately engaging said clutch dogs,;an actuating'device for said reversing mechanism, said actuating device being .rotatably mounted and movable byrotation to neutral and driving positions, abrake band for said drum means, resilient means tending to apply said brake band against said drum means, and a camming device operable by rotation of said actuating device for spreadingsaid brake band.

In witnessywhereofll have hereunto subscribed my name.

- CARL ZETTERLUN D. 

